<template>
    <div>
        <!-- 面包屑导航区 --> 
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>     
        </el-breadcrumb>
        <!-- 卡片视图区域 -->
        <el-card>
            <!-- 头部警告区域 -->
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>
            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类</span>
                    <!-- 级联选择框 -->
                    <el-cascader
                    expand-trigger="hover"
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"
                    size="small"
                    class="el-cascader"></el-cascader>
                </el-col>
            </el-row>
            <!-- tab页签区域  -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe="">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisable" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                        <el-table :data="onlyTableData" border stripe="">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tag标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                                    {{item}}
                                </el-tag>
                                <!-- 输入的文本框 -->
                                <el-input
                                class="input-new-tag"
                                v-if="scope.row.inputVisible"
                                v-model="scope.row.inputValue"
                                ref="saveTagInput"
                                size="small"
                                @keyup.enter.native="handleInputConfirm(scope.row)"
                                @blur="handleInputConfirm(scope.row)"
                                >
                                </el-input>
                                <!-- 添加的按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>  
        </el-dialog>

        <!-- 修改参数的对话框 -->
         <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        
        </el-dialog>
    </div>
</template>

<script>
export default {
    data(){
        return{
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',//选中的值
                label:'cat_name',//看到的值
                children:'children'//父子节点嵌套属性
            },
            //级联选择框双向绑定到的数组
            selectedCateKeys:[],
            //默认被激活的页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框显示与隐藏
            addDialogVisible:false,
            // 添加参数的表订单数据对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[{
                    required:true,message:'请输入参数名称',trigger:'blur'                 
                }]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{},
            // 修改的表单验证规则
            editFormRules:{
                    attr_name:[{
                    required:true,message:'请输入参数名称',trigger:'blur'                 
                }]
            },
         
        }
    },
    created(){
        //获取所有商品分类列表
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res}=await this.$http.get('categories')
            if(res.meta.status!==200){
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist=res.data
            console.log(this.catelist);
            
        },
        //级联选择框选中项变化会触发这个函数
        handleChange(){
            this.getParamsData()
        },
        //tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName);
            this.getParamsData()
        },
        //获取列表数据
        async getParamsData(){
            //证明选择的不是三级分类
            if(this.selectedCateKeys.length!==3){
                this.selectedCateKeys=[]
                this.manyTableData=[]
                this.onlyTableData=[]
                return
            }
            //如果选中三级分类，则吧所有该分类的数据获取出来
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:this.activeName}})
            if(res.meta.status!==200){
                return this.$message.error('获取参数列表失败！')
            }
           
            res.data.forEach(item=>{
                item.attr_vals=item.attr_vals ? item.attr_vals.split(' ') : []

                // 控制文本框的显示与隐藏
                item.inputVisible=false
                //文本框中输入的值
                item.inputValue=''
            
            })

            
            //判断数据属于many表格还是only表格，从而渲染到对应表格的数组上
            if(this.activeName==='many'){
                this.manyTableData=res.data
            }else{
                this.onlyTableData=res.data
            }
            
        },
        //监听对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid) return
                const {data:res}=await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==201){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        // 点击按钮显示修改对话框
        async showEditDialog(attr_id){
            //查询当前参数的信息
            const {data:res}=await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })
            if(res.meta.status!==200){
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm=res.data

            this.editDialogVisible=true
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        //点击按钮修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return 
                const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status!==200){
                    return this.$message.error('修改失败！')
                }
                this.$message.success('修改成功！')
                this.getParamsData()
                this.editDialogVisible=false
            })
        },
        // 根据ID删除对应参数项
        async removeParams(attr_id){
            const confirmResult=await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err=>err)

        // 用户取消了删除操作
        if(confirmResult!=='confirm'){
            return this.$message.info('已取消删除！')
        }
        // 删除
        const {data:res}=await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
        if(res.meta.status!==200){
            return this.$message.error('删除参数失败！')
        }
        this.$message.success('删除参数成功！')
        this.getParamsData()
        

        },
        //文本框失去焦点或者按下enter键触发的添加tag标签的函数
        async handleInputConfirm(row){
            //输入不符合规则的数据
            if(row.inputValue.trim().length===0){
                row.inputValue=''
                row.inputVisible=false
                return
            }
            //输入正确数据
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue=''
            row.inputVisible=false
            //发起请求保存此次参数
           this.saveAttrValues(row)
            
        },
        //将对attr_values的操作保存到数据库
        async saveAttrValues(row){
              const {data:res}=await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name:row.attr_name,
                attr_sel:row.attr_sel,
                attr_vals:row.attr_vals.join(' ')
            })
            if(res.meta.status!==200){
                return this.$$message.error('修改参数项失败！')
            }
            return this.$message.success('修改参数项成功！')
            
        },
        // 点击按钮展示文本输入框
        showInput(row){
            row.inputVisible=true
            //让文本框自动获得焦点
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
        })
        },
        //删除tag标签
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrValues(row)
        }
    },
    computed:{
        //如果按钮被禁用返回true 否则返回false
        isBtnDisable(){
            if(this.selectedCateKeys.length!==3){
                return true
            }
            return false
        },
        // 这是当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length===3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName==='many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt{
    margin: 15px;
}
.el-cascader{
    margin-left: 15px;
}
.el-tag{
    margin-right: 15px;
}
.input-new-tag{
    width: 120px;
}

</style>